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三峡水库正常蓄水后支流沉积物的污染特征

封丽 李崇明 胡必琴 张韵 黄健盛 张君

封丽, 李崇明, 胡必琴, 张韵, 黄健盛, 张君. 三峡水库正常蓄水后支流沉积物的污染特征[J]. 环境科学研究, 2016, 29(3): 353-359.
引用本文: 封丽, 李崇明, 胡必琴, 张韵, 黄健盛, 张君. 三峡水库正常蓄水后支流沉积物的污染特征[J]. 环境科学研究, 2016, 29(3): 353-359.
FENG Li, LI Chongming, HU Biqin, ZHANG Yun, HUANG Jiansheng, ZHANG Jun. Analysis of Pollution Characteristics of Surface Sediments in Three Gorges Reservoir after Normal Impoundment[J]. Research of Environmental Sciences, 2016, 29(3): 353-359.
Citation: FENG Li, LI Chongming, HU Biqin, ZHANG Yun, HUANG Jiansheng, ZHANG Jun. Analysis of Pollution Characteristics of Surface Sediments in Three Gorges Reservoir after Normal Impoundment[J]. Research of Environmental Sciences, 2016, 29(3): 353-359.

三峡水库正常蓄水后支流沉积物的污染特征

基金项目: 国家水体污染控制与治理科技重大专项(2009ZX07104-002)

Analysis of Pollution Characteristics of Surface Sediments in Three Gorges Reservoir after Normal Impoundment

  • 摘要: 为研究三峡水库不同时期沉积物污染变化规律,采集三峡库区175 m正常蓄水后7条支流表层沉积物样品,分析营养盐、重金属含量和污染特征,结果表明:7条支流表层沉积物均存在营养盐含量超标现象,但仍处于多数底栖生物可承受水平,其中龙溪河21号断面w(TN)和19号断面w(TP)最高,分别为1.97、2.03 g/kg;采用EF(富集因子)和RI(潜在生态风险指数)评价了重金属富集程度和污染水平,重金属EF表现为Hg>As>Cd>Pb>Cu>Zn>Mn>Cr,仅Mn和Cr的EF小于1,未受污染;RI平均值为160±35,处于中度生态风险. 沉积物中TN、TP来源以农业面源污染为主,TOM主要来源于浮游动物和浮游植物;重金属污染则以流域工业污水排放和农业活动为主. 研究显示,三峡库区蓄水后沉积物中营养盐和重金属含量总体呈上升趋势,建议划分优先控制区域,重点解决农业面源污染,强化农村生活污水治理,并以严格的环境准入制度防控和削减流域工业污染.

     

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  • 收稿日期:  2015-03-09
  • 修回日期:  2015-12-18
  • 刊出日期:  2016-03-25

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